RS-232 and other serial ports and interfaces  > obsolete computers pinouts
Pin Name Dir Description
1PG-Protective Ground
2TXD-->Transmit Data
3RXD<--Receive Data
4RTS-->Request to Send
5CTS<--Clear to Send
6DSR<--Data Set Ready
7GND-Signal Ground
8DCD<--Carrier Detect
9DTR-->Data Terminal Ready
9 pin D-SUB female connector layout
9 pin D-SUB female connector
at the computer
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Source(s) of this and additional information: Mayer´s SV738 X´press I/O map, from Hardware Book
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